RPN Calculator Subtraction

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As a user, I want to be able to subtract two numbers so that I don't have to do the work manually

UAT

  • [] 8 <enter> 5 <minus> -> [3]
  • [] -3 <enter> -9 <minus> -> [6]
  • [] 4.2 <enter> 2.3 <minus> -> [1.9]
  • [] 3 <minus> -> [-3]
  • [] <minus> -> [0]


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